Abstract

We observe experimentally and numerically novel mixed-mode dynamic states of a diode laser subject to two delayed optical feedbacks. These states have been proposed and analyzed within the framework of the Lang–Kobayashi single-feedback model. Such states are combinations of two distinct external cavity modes and can be identified through a characteristic sequence of a Hopf bifurcation followed by a secondary quasi-periodic bifurcation. We present experimental and numerical results that demonstrate such sequences.

Figures (5)

Experimental optical spectra as a function of ΔI2. Threshold reduction from the first cavity is fixed at ΔI1=2.40%. The laser is stable in traces (b) and (g), periodic in (c) and
(d), quasi-periodic in (e), and displays LFF in (f).